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Mayr, Herbert and Schütz, Franz (1981): Addition and cycloaddition reactions of allenyl cations with various cycloalka-1,3-dienes. In: Tetrahedron Letters, Vol. 22, No. 10: pp. 925-928
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Abstract

Allenyl cations , generated from propargyl chlorides and zinc chloride give monocyclic adducts or [3+4] and [2+4] cycloaddition products with various cycloalka-1,3-dienes. The mode of addition depends on R and the ring size of the 1,3-dienes.